The Autobots have been forced into hiding as the Decepticons take control of their new fortress, Darkmount. Shockwave arrives on Earth following years of isolation on Cybertron and begins plans to unleash the ultimate Autobot hunter in an attempt to find the remaining Autobots and put an end to all resistance to Decepticon rule. The Autobots and humans have one chance to defeat a common foe and protect their home.
Transformers: Prime (Season 3, Volume 1) - Battle for Darkmount
A New Enemy Revealed